Wladyslaw Rudzinski

Statistical thermodynamics of adsorption from multicomponent liquid mixtures on heterogeneous solid surfaces

The statistical thermodynamics of adsorption from multicomponent liquid mixtures on heterogeneous solid surfaces is discussed by assuming the cell adsorption model and ideal adsorbed phase.Two integral representations for the adsorption isotherm are proposed: one based onn-dimensional energy distribution function (i.e., each adsorption site is characterized by adsorption energies of all components), and the other based on distribution of differences of adsorption energies ofn-1 components in relation to adsorption energy of the chosen component (i.e., each adsorption site is characterized byn-1 differences of adsorption energies of the components in relation to adsorption energy of the chosen component).The expressions for differential adsorption heat for adsorption from binary liquid mixtures have been derived from both integral equations.ZusammenfassungDie statistische Thermodynamik der Adsorption von aus mehreren Komponenten bestehenden flüssigen Mischungen auf heterogenen festen Oberflächen wird für das Modell der Zellenadsorption bei ideal adsorbierter Phase diskutiert.Zwei Integraldarstellungen der Adsorptionsisotherme werden vorgeschlagen: eine auf einen-dimensionale Verteilungsfunktion der Energie gestützte (das heißt, jede Adsorptionsstelle wird durch Adsorptionsenergien von allen Komponenten charakterisiert); die andere basiert auf der Verteilung der Unterschiede von Adsorptionsenergien dern-1-Komponenten in bezug auf die Adsorptionsenergie der ausgewählten Komponente (das heißt, jede Adsorptionsstelle wird durchn-1-Unterschiede charakterisiert. Formeln für differentiale Adsorptionswärmen für die Adsorption aus binären flüssigen Mischungen sind von beiden Integral-Gleichungen abgeleitet worden.

Thermodynamics of monolayer localized adsorption of single gases on heterogeneous surfaces with random topography of sites

A systematic model investigation has been made of the simultaneous behaviour of adsorption isotherms, isosteric heats of adsorption and heat capacities of single gases adsorbed on heterogeneous solid surfaces with random topography of sites. The localized interacting admolecules are treated using quasi-chemical approximation and assuming an exponential distribution of adsorption energies. The regions of both supercritical and subcritical temperatures are investigated. The results of this model investigation are discussed in the light of previously published experimental data.

Adsorption from solutions on solid surfaces. Effects of surface heterogeneity on adsorption isotherms and heats of immersion

Equations for the excess adsorption isotherms and the heats of immersion are developed, taking the surface heterogeneity effects of the solids into account. It is shown that taking the heterogeneity effects into account leads to an improvement due to agreement between theory and experiment and provides a new picture of the non-ideality of the adsorbed phase.

Adsorption on heterogeneous surfaces. Density distribution of a gas near a solid

A new approach to adsorption on heterogeneous solid surfaces is proposed by assuming a three-dimensional adsorption model. The method is based on perturbation calculations of the local density of a gas near a solid surface.

QUANTITATIVE ESTIMATION OF SURFACE HETEROGENEITY IN PHYSICAL ADSORPTION ON HETEROGENEOUS SOLID SURFACES PART 1, ADSORPTION FROM GASEOUS ADSORBATE PHASE

Es wird versucht, ein allgemeines Verfahren zur Bestimmung der Oberflachenhetero- genitat aus experimentellen Daten zu entwickeln und zwar bei Adsorption von Gasen oder F lussigkeitsmischungen.